In Joe 3.5, the built-in 'build' command puts the editor in a faulty state if the compilation is interrupted after starting.
This can be observed after doing a ESC-C, and stopping the compilation process before it finishes, by pressing CTRL-C. Close the remaining small compilation window so that the main editor window is left. Again press ESC-C, and you can see that the editor state is funky.
I've traced this down to an issue with 'build', by running only the build command using: ESC-X, build. And interrupting the build-in-progress using CTRL-C. Now press ESC-C and observe the issue.
A possible fix is to act as if 'build' was never started when it is interrupted before it finishes.
Cheers,
Achie
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This seems to report the same issue as 1719873
This was fixed.